212 



EFFECTS ON ALCOHOLIC FERMENTATION 



The acceleration, following exposure to the rays, is shown in 

 FIGURE 60. 



°a c.c. 



36 

 32 

 28 

 24 



30' 

 26' 



20 



16 

 12 



Time 



Fig. 60. Acceleration of Alcoholic Fermentation by Rajs from Radium of 1,800,000 



Activity. 



Experiment 89 



To ascertain the effect of exposing yeast-cells [Saccharomyces)\.o 

 the rays of radium before fermentation began, i gm. of a Fleisch- 

 mann's compressed yeast-cake was pressed closely around the end of 

 three sealed glass tubes containing, respectively, RaBrg of 1,500,000 

 activity ; RaBr2 of 10,000 activity ; and an empty glass tube. 



After an exposure of 20 hours to the rays of radium, the yeast 

 was removed from the tubes, and each piece was placed in a beaker 

 containing 100 c.c. of a 10 per cent, solution of cane-sugar. After 

 thoroughly mixing the yeast in the solution, three fermentation tubes 

 were filled with the mixture from each beaker respectively, and 

 placed in the thermostat oven. Readings of the scale showing the 

 evolution of gas due to fermentation were recorded as follows : 



